Can I allow a family member access to my FS tree if family member not have a FS account
We understand that you would like to give someone else access to your Family Tree.
Access to Family Tree is free. Therefore the best solution is to have your family member create their own account and you will share the common deceased ancestors.
Family Tree protects the privacy of living people by putting their records in the contributor's private space and restricting who can see the private space. Therefore your relative will have to create a record for the living persons to bridge those generations to get to the deceased persons you share.
You may get live help by clicking on Help then Contact Us for the appropriate hours and phone number.
Some more complete parts of Family Tree have Discovery Pages: those are on the open web where search engines can find them. Have you tried it? Notice the "en" in the URL; pages can be viewed in other languages.